Keeping the extremities warm and at a constant temperature is best for Raynauds. It is a sudden temperature change that will trigger it. Things like wearing gloves to answer the door, put out the rubbish in autumn / winter/ spring will help lessen the effects. In extreme cases Nifedipine can be prescribes by the GP to help dilate blood vessels again will lessen the effect of, but not stop, the abnormal vasoconstriction.